PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791273203',
];

$_COOKIE = [
    'PHPSESSID' => 'tue1oevkjrc03tv2db915tmv35',
    '_csrf' => '19fba21bda846c55e97206d9c4dd04f225c8f8fd7b452651f66bd84994ee7658a:2:{i:0;s:5:"_csrf";i:1;s:32:"9gPSo4Rv50DNHQQTaeJPky_U3-8brJxc";}',
    'topics-session' => '1791374143.616.16855.289463|d197bbbd1d400bd72372bc93068ad169',
];

$_SESSION = [
    '__flash' => [],
];